Summary

After upgrading from constructs 10.4.2 to 10.4.3, my dependency manager began pulling in
typeguard 4.x (instead of <3), which caused AWS CDK (aws-cdk-lib) to emit large numbers of
runtime warnings during cdk synth and bundling operations.

Downgrading constructs back to 10.4.2 immediately caused typeguard to be resolved
back to 2.x, and the warnings disappeared.

This suggests that constructs 10.4.3 has relaxed or altered its dependency constraints in a way
that allows jsii to resolve to a version compatible with typeguard>=4, which is currently
not fully compatible with CDK’s runtime type checking behavior.

Environment

• Python 3.13
• aws-cdk-lib: 2.223.0
• jsii: resolved via constructs (1.119.0)
• typeguard: 2.13.3 → 4.2.1 after upgrading constructs

Impact

typeguard 4.x introduces strict Protocol checking, and CDK uses many non-runtime-checkable
Protocols (IRole, IVpc, IFunction, etc.). This results in hundreds of warnings, like the following:

UserWarning: Typeguard cannot check the IRole protocol because it is a non-runtime protocol. If you would like to type check this protocol, please use @typing.runtime_checkable
  typeguard.check_type(value=value, expected_type=expected_type, collection_check_strategy=typeguard.CollectionCheckStrategy.ALL_ITEMS) # type:ignore